A process for the preparation of compounds of formula IA, where R═CH
3
(i.e. temozolomide):
comprising diazotizing a compound of the formula IIA:
where in R is as defined above in the presence of at least one metal halide, an acid and a source of nitrous acid, followed by conversion of acidic solution containing temozolomide. The conversion can be carried out by a liquid-liquid extraction technique in a water immiscible solvent. The temozolomide may be further purified in an acetone-water mixture.
一种制备式为IA的化合物的方法,其中R═
CH3(即特
莫唑胺):包括在至少一种
金属卤化物、酸和
亚硝酸源的存在下,重氮化式为IIA的化合物:其中R如上所定义,随后通过液液萃取技术在不溶于
水的溶剂中转化含特
莫唑胺的酸性溶液。特
莫唑胺可以在
丙酮-
水混合物中进一步纯化。